Method for coating a component

Abstract

The present invention is directed to a method for coating a component, wherein the component has a first and a second surface, and wherein the first and the second surface adjoin each other at an edge, in which method i) first of all, the edge between the first and the second surface is rounded, and ii) subsequently, a coating is applied to the first surface.

What is claimed is: 
     
       1. A method for coating a blade body for a turbomachine, wherein the blade body has a first and a second surface and wherein the first and the second surface adjoin each other at an edge, the method comprising the steps of:
 i) first, rounding an entire length of the edge between the first and second surfaces, and 
 ii) subsequently, applying a coating to the first surface, 
 wherein the rounding of the edge in step i) comprises a processing with a brush prior to application of the coating to the first surface. 
 
     
     
       2. The method according to  claim 1 , wherein a rounding introduced in step i) between the first and second surfaces has, as viewed in section, a radius of curvature R that corresponds to at least 0.5 times a thickness d of the coating, that is, R≥0.5·d. 
     
     
       3. The method according to  claim 1 , wherein a rounding introduced in step i) between the first and second surfaces has, as viewed in a section, a radius of curvature R that corresponds to at most 5 times a thickness d of the coating, that is, R≤5·d. 
     
     
       4. The method according to  claim 1 , wherein the first surface is processed in a material-removing manner prior to step i) and the edge is thereby produced. 
     
     
       5. The method according to  claim 1 , wherein, in step i), after the processing with the brush and prior to application of the coating to the first surface, a grinding processing occurs. 
     
     
       6. The method according to  claim 1 , wherein the coating is applied in a galvanic manner in step ii). 
     
     
       7. The method according to  claim 1 , wherein the coating contains boron nitride. 
     
     
       8. The method according to  claim 1 , wherein the first surface is a blade tip surface and the second surface is a side surface of the blade body. 
     
     
       9. A method for producing a blade body for a turbomachine, wherein the blade body is coated in a method in accordance with  claim 1 .